The other thing is that if JKR - with her wealth, her very clear moral fibre and bravery and her easy access to lawyers - is receiving this kind of abuse, how on earth would any normal woman (like me) stand up for safeguarding in the real world?
Women like Posie Parker have had their kids doxxed by standing up for women and for safeguarding. Look at what happened to Marion Millar and Kate Scottow. Real harms visited upon their children or threatened to their children. The state machinery being used by TRAs to heap stress on vulnerable women and children.
Normal women are scared to speak up, of course they are. JKR knows this, she gets thousands of anonymous emails from women thanking her because they feel, they know, they cannot speak up for fear of the harms that would happen to their children if they are brave enough to state that sex is real.
If THIS is happening to JKR, imagine how easy it is to silence a normal Mum.
Mumsnet, by virtue of its anonymity, is one of the few places women can speak relatively freely and say what they really think (and we can't even do that on the feminism boards). MOST people absolutely agree with JKR, especially once they've actually bothered to read what she wrote.
Remember in the HP books how lots of people pretended they agreed with Doloris umbridge out of fear even when they secretly thought Harry was probably right and there was increasing evidence that he was? We're about there.